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WO2004004367A2 - Procede et appareil de modulation a codage turbo spatio-temporel - Google Patents

Procede et appareil de modulation a codage turbo spatio-temporel Download PDF

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Publication number
WO2004004367A2
WO2004004367A2 PCT/US2003/020595 US0320595W WO2004004367A2 WO 2004004367 A2 WO2004004367 A2 WO 2004004367A2 US 0320595 W US0320595 W US 0320595W WO 2004004367 A2 WO2004004367 A2 WO 2004004367A2
Authority
WO
WIPO (PCT)
Prior art keywords
space
channel
time
coded symbol
symbol streams
Prior art date
Application number
PCT/US2003/020595
Other languages
English (en)
Other versions
WO2004004367A3 (fr
Inventor
Pieter Van Rooyen
Danie Van Wyk
Original Assignee
Zyray Wireless, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zyray Wireless, Inc. filed Critical Zyray Wireless, Inc.
Priority to EP03762253A priority Critical patent/EP1520356A4/fr
Priority to CN038149788A priority patent/CN1663144B/zh
Priority to AU2003253760A priority patent/AU2003253760A1/en
Publication of WO2004004367A2 publication Critical patent/WO2004004367A2/fr
Publication of WO2004004367A3 publication Critical patent/WO2004004367A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0625—Transmitter arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0059—Convolutional codes
    • H04L1/006—Trellis-coded modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0065—Serial concatenated codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0066—Parallel concatenated codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0067—Rate matching
    • H04L1/0068—Rate matching by puncturing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0612—Space-time modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0631—Receiver arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0637—Properties of the code
    • H04L1/065—Properties of the code by means of convolutional encoding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0637—Properties of the code
    • H04L1/0656—Cyclotomic systems, e.g. Bell Labs Layered Space-Time [BLAST]

Definitions

  • the present invention relates generally to wireless communications and, more particularly, to a space-time and channel coding modulation scheme for use in wireless communication systems.
  • radio-based communication As mobile radio-based communication becomes more widely accepted, it will be desirable to provide various types of radio-based communication services to meet consumer demand. For example, support for facsimile, e-mail, video, Internet access, and the like via radio-based communication systems is envisioned. Moreover, it is expected that mobile users may wish to access different types of services at the same time. For example, a videoconference between two mobile users would involve both speech and video support. Some of these different services will require relatively high data rates compared with speech service that has been conventionally supplied by mobile radio-based communication systems. Accordingly, next generation mobile radio-based communication systems are being designed to provide the high and variable-rate data rate communication bandwidth required by such services.
  • UMTS Universal Mobile Telecommunications System
  • 3GPP Third Generation Partnership Project
  • GSM Global System for Mobile Communications
  • UTRAN Universal Terrestrial Radio Access Network
  • Frequency Division Duplex FDD
  • TDD Time Division Duplex
  • CDMA code division multiple access
  • TCM trellis coded modulation
  • turbo trellis coding techniques have evolved over the past two decades as a combined coding and modulation technique for digital transmission over band-limited channels.
  • TCM offers a significant advantages relative to classical coding schemes in both power and bandwidth efficiency.
  • TCM schemes use redundant non-binary modulation in combination with a finite-state encoder that determines a corresponding signal shape to be transmitted over the applicable channel.
  • the received signals are decoded by a soft-decision maximum-likelihood (ML) Viterbi or maximum a posteriori (MAP) decoder.
  • ML soft-decision maximum-likelihood
  • MAP maximum a posteriori
  • the invention may be characterized as a system and method for transmitting a signal from a plurality of antennas.
  • the inventive method includes the steps of: encoding a stream of data according to a turbo multiple trellis coded modulation scheme, thereby generating a plurality of parallel channel-coded symbol streams; space-time encoding the plurality of parallel channel-coded symbol streams, thereby generating a plurality of space-time-channel-coded symbol streams; and transmitting the plurality of space-time-channel-coded symbol streams.
  • the invention may be characterized as an apparatus for transmitting a signal from a plurality of antennas, the apparatus including: an outer encoder configured to encode a stream of data according to a turbo multiple trellis coded modulation scheme, thereby generating a plurality of channel-coded symbol streams; an inner encoder coupled to the outer encoder, wherein the inner encoder is configured to receive the channel-coded symbol streams and provide space-time coding to the channel-coded symbol streams, thereby generating a plurality of space-time-channel-coded symbol streams; and a plurality of antennas coupled to the inner encoder, wherein each of the plurality of antennas is configured to transmit one of the plurality of space-time-channel-coded symbol streams.
  • FIG. 1 is a high-level block diagram representation of a conventional UMTS mobile communication system in which some embodiments of the present invention is implemented;
  • FIG. 2 is a block diagram depicting an overview of the architecture of the uplink transmitter of FIG. 1 according to one embodiment
  • FIG. 3 is a block diagram depicting an STTCM modulator in accordance with several embodiments of the present invention
  • FIG. 4 is a block diagram of an STTCM demodulator in accordance with several embodiments of the present invention.
  • FIG. 5 is a block diagram of one embodiment of the outer encoder of FIG. 3;
  • FIGS. 6 A and 6B are input/ouput/state connection diagrams for 2-state and 4-state implementations of the outer encoder of FIG. 5 respectively;
  • FIG. 8 is a block diagram of another embodiment of the outer encoder of FIG. 3;
  • FIGS. 9 A and 9B illustrate state and superstate diagrams respectively for a rate-2/4 space-time outer code for the outer encoder of FIG. 8.
  • the present invention contemplates a unique space-time turbo-coded modulation
  • STTCM turbo multiple trellis coded modulation
  • T-MTCM turbo multiple trellis coded modulation
  • the STTCM scheme of the present invention results in substantial coding gains in mobile communication systems, particularly in systems operating in multipath fading environments.
  • the STTCM scheme according to several embodiments of the present invention is applicable in fixed and wireless contexts to any form of digital communication system including voice, multi-media, navigational and telemetry communication systems.
  • the STTCM scheme in several embodiments is also applicable to a variety of communication protocols including time division multiple access (TDMA) and code- division multiple access (CDMA) in both single carrier and multiple carrier (e.g., orthogonal frequency division multiplexing (OFDM) contexts.
  • TDMA time division multiple access
  • CDMA code- division multiple access
  • OFDM orthogonal frequency division multiplexing
  • FIG. 1 provides a high-level block diagram representation of a conventional UMTS mobile communication system 100 in which the present invention, in some embodiments, is implemented.
  • user equipment (UE) 104 communicates with a base station 102 via a wireless link 120.
  • the UE 104 may, for example, comprise a mobile radiotelephone handset or similar subscriber device (e.g., a PDA equipped with a radio transceiver).
  • Wireless link 120 includes an uplink 122 and a downlink 124.
  • a transmitter 112 in base station 102 transmits radio frames over downlink 124 that are received by a receiver 116 in UE 104.
  • a transmitter 114 in UE 104 transmits radio frames over uplink 122 that are received by a receiver 110 in base station 102.
  • the transmitter/receiver pairs in base station 102 and UE 104 can be implemented, for example, as separate functional units (as depicted in FIG. 1) or as a single transceiver unit.
  • the base station 102 and user equipment 104 represent residential transceivers in a local wireless network.
  • the base station 102 is an access point to other communication networks, for example, a cable interface or a satellite interface to an Internet (e.g., within a set-top box), while the user equipment 104 comprises mobile electronic devices, e.g., computers (PCs), laptops, televisions, stereos, appliances, palm devices, appliances, etc.
  • the base station 102 is a terrestrial base station in a cellular network and the user equipment 104 is a mobile handset. It should be noted, however, that the present invention is not limited to wireless communication networks.
  • the transmitters 112 and 114 comply with the requirements set forth in 3GPP UTRAN FDD transmitter specifications, such as 3GPP TS 25.212 V3.5.0 (200-12) entitled "3 rd Generation Partnership Project; Technical Specification Group Radio Access Network; Multiplexing and channel coding (FDD)" (Release 1999), the entirety of which is incorporated herein by reference.
  • 3GPP UTRAN FDD transmitter specifications such as 3GPP TS 25.212 V3.5.0 (200-12) entitled "3 rd Generation Partnership Project; Technical Specification Group Radio Access Network; Multiplexing and channel coding (FDD)" (Release 1999), the entirety of which is incorporated herein by reference.
  • This specification is referred to herein as the 25.212 specification. It should be recognized, however, the present invention is in no way limited to applications utilizing the 25.212 specification.
  • FIG. 2 shown is a block diagram depicting an overview of the architecture of uplink transmitter 114 according to one embodiment. It should be noted that in several embodiments the downlink transmitter 112
  • uplink transmitter 114 includes a medium access control (MAC) layer 252, a coding/multiplexing unit 254, and an output stage 256.
  • the coding/multiplexing unit 254 functions to exchange data with MAC 252 in the form of transport block sets from M transport channels 282. These transport blocks are processed and multiplexed together by coding/multiplexing unit 254 into radio frame data provided over N physical channels 284.
  • the radio frame data is gain-scaled, spread, scrambled, pulse- shaped and modulated in preparation for its transmission over uplink 122.
  • FIG. 3 shown is a block diagram generally depicting a space-time turbo-coded modulation (STTCM) modulator 300 in accordance with several embodiments of the present invention.
  • the modulator 300 may be configured for inclusion in an uplink or a downlink transmitter, such as the uplink transmitter 114.
  • the modulator 300 includes an outer encoder 304, an interleaver 308, and an inner encoder 312.
  • the outer encoder 304 is employed with a goal of maximizing coding gain
  • the inner encoder 312 is employed with a goal of maximizing diversity gain.
  • the outer encoder 304 modulates an incident data stream and generates a corresponding symbol stream for interleaving within the interleaver 308.
  • the outer encoder 304 comprises a convolutional encoder, and in other embodiments, the outer encoder 304 comprises a turbo multiple trellis coded modulation T- MTCM encoder.
  • the outer encoder 304 is a multiple trellis coded modulation (MTCM) encoder designed in accordance with design criteria set forth in the publication entitled: On the Construction of Layered Space-Time Coded Modulation STCM Codes Employing MTCM Code Design Techniques; by D.J. van Wyk, I.J. Oppermann, E. Preforms, and P.G.W. van Rooyen; in IEEE VTC'99: Vehicular Technology Conference, (Amsterdam, The Netherlands), pp. 2969-2973, September 1999, which is hereby incorporated by reference in its entirety.
  • MTCM multiple trellis coded modulation
  • the inner encoder 312 then modulates the interleaved, modulated symbols from the interleaver 308.
  • the inner encoder 312 is a space-time coded modulation encoder, which in some embodiments, is realized using conventional space-time processing techniques including, for example, block, convolutional and trellis coding. Implementation of space-time processing techniques is further described in the publication entitled: Space-Time Processing for CDMA Mobile Communications; by Pieter van Rooyen, Michael Lotter, and Danie van Wyk; Kluwer Academic Publishers, 2000, which is hereby incorporated by reference in its entirety.
  • the modulated signals from the inner encoder 312 are then upconverted to RF signals that are transmitted by transmit antennas 314, 316.
  • the antennas 314, 316 are separated to provide transmit diversity. In one embodiment, for example, the antennas 314, 316 are separated so that a fading correlation between the antennas 314, 316 is reduced to below .5.
  • the space-time turbo-coded modulation (STTCM) modulator 300 is constructed according to a systems based approach. In other words, after the individual components (e.g., the outer and inner encoders 304, 312) of the STTCM modulator 300 have been optimized on an individual basis, the STTCM modulator 300 is analyzed and evaluated to make sure the best overall performance is achieved.
  • the outer encoder 304 and the inner encoder 312 are first individually optimized to maximize coding gain and diversity gain respectively, and then, once the outer and inner encoders 304, 312 are combined, the complete system performance of the STTCM modulator 300 is optimized.
  • an EXIT chart based analysis is utilized to evaluate information transfer between constituent system blocks (e.g., between the outer and inner encoders 304, 312), and to identify critical system parameters that include, for example, the number of turbo iterations, stopping criteria, and symbol interleaver span and depth.
  • the present invention is applicable to both single carrier systems, e.g., GSM systems, and multi-carrier systems, e.g., OFDM systems.
  • the space-time turbo-coded modulation (STTCM) modulator 300 may be implemented in an OFDM system, for example, by simply changing the outer encoder 304.
  • the inner encoder 312 and the decoder can be used in an OFDM system without significant changes.
  • FIG. 4 shown is an STTCM demodulator 400 in accordance with several embodiments of the present invention.
  • the STTCM demodulator 400 includes a space-time maximum a posteriori (MAP) decoder 402 disposed to process the received signal after despreading.
  • MAP space-time maximum a posteriori
  • the decoded signal from the space-time MAP decoder 402 is provided to a de-interleaver 406, which feeds a decoder 410, which in some embodiments is a Viterbi decoder, and in other embodiments is a MAP decoder.
  • a channel state estimator 414 is coupled between the input of the space-time MAP decoder 402 and the decoder 410.
  • dispreading, descrambling and de-interleaving is performed in dedicated hardware and turbo decoding is performed by a digital signal processor (DSP).
  • DSP digital signal processor
  • FIG. 5 shown is a block diagrammatic representation of an exemplary implementation of the outer encoder 304 of FIG. 3 as a multiple trellis coded modulation (MTCM) encoder.
  • MTCM multiple trellis coded modulation
  • a first QPSK mapper 502 receives input data and provides a corresponding symbol stream to a first MTCM encoder & QPSK mapper unit
  • the output from the first MTCM encoder & QPSK mapper unit 506 is processed by a first symbol selector & puncturer 510 operative to provide a first punctured symbol stream to the inner encoder 312.
  • the output from the symbol interleaver 514 is provided to an M th MTCM encoder & QPSK mapper unit 518, which in turn feeds symbol de-interleavers 522 and 526.
  • An M th symbol selector & puncturer 530 which is responsive to the first MTCM encoder & QPSK mapper unit 506 and to the symbol de-interleaver 526, generates an M punctured symbol stream for the inner encoder 312.
  • FIGS. 6 A and 6B are input/ouput/state connection diagrams for 2-state and 4-state implementations of the outer encoder 304, respectively.
  • FIGS. 7A and 7B are trellis diagrams for space-time codes for 2-state and 4-state implementations of the outer encoder 304, respectively.
  • FIG. 8 is a block diagram illustrating another embodiment of the outer encoder 304 of FIG. 3 as a space-time turbo multiple trellis coded modulation T-MTCM encoder.
  • a first trellis coded modulation (TCM) encoder 804 and an M th trellis coded modulation (TCM) encoder 806 receive input data and provide corresponding coded symbol streams to a first block symbol interleaver 808 and an M th block symbol interleaver 810 respectively.
  • the outputs from the block symbol interleavers 808, 810 are provided to a first and M th QPSK mapper units 812, 814 respectively, which in turn, feed an inner space-time encoder, e.g., the inner encoder 312.
  • FIGS. 9A and 9B respectively depict state and superstate diagrams for a rate-2/4 space-time outer code for the outer encoder of FIG. 8.
  • the foregoing description for purposes of explanation, used specific nomenclature to provide a thorough understanding of the invention. However, it will be apparent to one skilled in the art that the specific details are not required in order to practice the invention. In other instances, well-known circuits and devices are shown in block diagram form in order to avoid unnecessary distraction from the underlying invention. Thus, the foregoing descriptions of specific embodiments of the present invention are presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, obviously many modifications and variations are possible in view of the above teachings. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Error Detection And Correction (AREA)

Abstract

L'invention porte sur un procédé et un appareil permettant d'émettre un signal depuis une pluralité d'antennes. L'appareil comprend un codeur externe configuré pour coder un flux de données conformément à une logique de modulation à codage turbo à treillis multiple et générer une pluralité de flux de symboles à codage de canal. L'appareil comprend également un codeur interne concaténé en série avec le codeur externe. Le codeur interne est configuré de façon à recevoir les flux de symboles à codage de canal et effectuer un codage spatio-temporel sur les flux de symboles à codage de canal, ce qui génère une pluralité de flux de symboles à codage de canal spatio-temporel. Une pluralité d'antennes sont couplées au codeur interne, chaque pluralité d'antennes étant configurée de façon à émettre une pluralité de la pluralité de flux de symboles à codage de canal spatio-temporel.
PCT/US2003/020595 2002-06-26 2003-06-26 Procede et appareil de modulation a codage turbo spatio-temporel WO2004004367A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP03762253A EP1520356A4 (fr) 2002-06-26 2003-06-26 Procede et appareil de modulation a codage turbo spatio-temporel
CN038149788A CN1663144B (zh) 2002-06-26 2003-06-26 用于时空Turbo编码调制的装置及方法
AU2003253760A AU2003253760A1 (en) 2002-06-26 2003-06-26 Method and apparatus for space-time turbo-coded modulation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US39193602P 2002-06-26 2002-06-26
US60/391,936 2002-06-26

Publications (2)

Publication Number Publication Date
WO2004004367A2 true WO2004004367A2 (fr) 2004-01-08
WO2004004367A3 WO2004004367A3 (fr) 2004-06-10

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US (1) US7460607B2 (fr)
EP (1) EP1520356A4 (fr)
CN (1) CN1663144B (fr)
AU (1) AU2003253760A1 (fr)
WO (1) WO2004004367A2 (fr)

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See also references of EP1520356A4

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Publication number Publication date
AU2003253760A8 (en) 2004-01-19
AU2003253760A1 (en) 2004-01-19
WO2004004367A3 (fr) 2004-06-10
US20040057531A1 (en) 2004-03-25
EP1520356A2 (fr) 2005-04-06
US7460607B2 (en) 2008-12-02
CN1663144B (zh) 2010-04-28
CN1663144A (zh) 2005-08-31
EP1520356A4 (fr) 2011-05-18

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